#include <stdint.h>
#include <string.h>
+#include "compiler.h"
#include "random.h"
#include "util.h"
#define ETH_ADDR_LEN 6
+static const uint8_t eth_addr_broadcast[ETH_ADDR_LEN] UNUSED
+ = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
static inline bool eth_addr_is_broadcast(const uint8_t ea[6])
{
return (ea[0] & ea[1] & ea[2] & ea[3] & ea[4] & ea[5]) == 0xff;
static inline void eth_addr_random(uint8_t ea[ETH_ADDR_LEN])
{
random_bytes(ea, ETH_ADDR_LEN);
+ ea[0] &= ~1; /* Unicast. */
+ ea[0] |= 2; /* Private. */
}
#define ETH_ADDR_FMT \
#define ETH_HEADER_LEN 14
#define ETH_PAYLOAD_MIN 46
+#define ETH_PAYLOAD_MAX 1500
#define ETH_TOTAL_MIN (ETH_HEADER_LEN + ETH_PAYLOAD_MIN)
-#define ETH_TOTAL_MAX (ETH_HEADER_LEN + VLAN_HEADER_LEN + 1500)
+#define ETH_TOTAL_MAX (ETH_HEADER_LEN + ETH_PAYLOAD_MAX)
+#define ETH_VLAN_TOTAL_MAX (ETH_HEADER_LEN + VLAN_HEADER_LEN + ETH_PAYLOAD_MAX)
struct eth_header {
uint8_t eth_dst[ETH_ADDR_LEN];
uint8_t eth_src[ETH_ADDR_LEN];
} __attribute__((packed));
BUILD_ASSERT_DECL(LLC_SNAP_HEADER_LEN == sizeof(struct llc_snap_header));
-#define VLAN_VID 0x0fff
+#define VLAN_VID_MASK 0x0fff
+#define VLAN_PCP_MASK 0xe000
#define VLAN_HEADER_LEN 4
struct vlan_header {
#define IP_VER(ip_ihl_ver) ((ip_ihl_ver) >> 4)
#define IP_IHL(ip_ihl_ver) ((ip_ihl_ver) & 15)
+#define IP_IHL_VER(ihl, ver) (((ver) << 4) | (ihl))
+#define IP_TYPE_ICMP 1
#define IP_TYPE_TCP 6
#define IP_TYPE_UDP 17
+#define IP_VERSION 4
+
+#define IP_DONT_FRAGMENT 0x4000 /* Don't fragment. */
+#define IP_MORE_FRAGMENTS 0x2000 /* More fragments. */
+#define IP_FRAG_OFF_MASK 0x1fff /* Fragment offset. */
+#define IP_IS_FRAGMENT(ip_frag_off) \
+ ((ip_frag_off) & htons(IP_MORE_FRAGMENTS | IP_FRAG_OFF_MASK))
+
#define IP_HEADER_LEN 20
struct ip_header {
uint8_t ip_ihl_ver;